The Tru-Strobe Tuner is an extremely accurate pitch measurement device, perfect for settling intonation, recording and live performances where being in tune is of the utmost importance. The tuner’s heavy-duty construction includes a built-in microphone and input jacks for tuning acoustic, as well as electronic instruments. The slightest difference between input frequency and the ideal frequency accumulates over time, and appears as movement on the circular LED interface. Once the movement stops, you are perfectly in tune.•Accurate to +/- .1 cent•Features true strobe tuning(not a simulation)